I can't see the answers well can i get a better shot at the exam / worksheet

Pls! does anybody know a shortcut for answering these types of questions in the future?

Find the distance between (0,5) & (-4,2)

The point a is at –2 and the point b is at 7. marissa would like to divide this line segment in a 4: 3 ratio, and she would like to use the formula x = (x2 – x1) + x1. what values should she substitute into the formula? a = a + b = x1 = x2 =